I think its A.
Sorry if it isn't.
Answer:
Students at white schools were treated unfairly
Answer:
parental controls or the air horn
Explanation:
parental controls limit the time children have to be creative(1) and they can restrict which parent can do what to each device if only one of them knows the password(2)
the air horn is an invention that is very loud and annoying(1) and there is no real use for it(2)
Japan was never colonised by Europeans